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One of the most important attributes that patients demand from their contact lenses today is comfort during wear. The demands of modern day living means that patients require comfortable wear for at least 12 hours a day. Patients often cite lens dryness and irritation as reasons for removing lenses from their eye earlier in the day than they would like. The most common reason for this is that their contact lenses lose water or 'become dry'. As soft lenses lose water their parameters can change and in some cases lead to steeper base curves, making the lens 'feel tighter on the eye' to the patient.
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